In honour of recent astronomical events–and Martin’s great posts–here’s a wonderful sequence of time-lapse photos (isn’t that called a movie or motion picture?) of the Aurora Borealis taken in Norway: Aurora time-lapse by Tommy Eliassen See more of the photographer’s great work (example below) here: http://500px.com/tommyeliassen Happy studying…and sky-gazing. Rick Smith’s Nagaokakyo